What changed in EDuke32, build by build

Fix console background disappearing intermittently

polymost.cpp: fix shadeFactor not being set properly for non-indexed colour textures

polymost.cpp: fix polymost_dorotatesprite() issue where sprites could be rendered with fractional positions and sizes leading to GL filtering imperfections.

sdlayer.cpp: fix vsync heartbeat issue on some NVidia & Intel drivers

game.cpp: fixed GL vsync resetting issue due to system_getcvars() call coming before cvars were loaded

workaround for texcache expecting all mipmap levels to be available

Fix building on Visual Studio after GLAD & Polymost changes

fix typo causing bug where persistentStreamBuffer was being reset to the config value when it should be disabled

fix bug where polymost2_drawVBO() wouldn't reset the bound buffer state properly for polymost1

screens.cpp: Fixed a bug in FPS calculation

polymost_dorotatesprite(): fix for Polymer bug introduced by Polymost drawarrays optimization

Fix line spacing tab issue in rev 6570.

Fix a number of cases where files opened with cache1d.cpp's kopen_internal() could be leaked.

Fixed file handle leak when loading a save game

Fixed race condition where XMP voices could be played by the audio driver thread before they were fully initialized or fully freed